Method of securing wires together



a v v June 20, 1939. E. w. KRUEGER 2,152,815

mwnon 0F sscumue WIRES TOGETHER Filed Nov. 6, 1937 Z SheetS-Sheet 1 June 20, 1939.

E. w. KRUEGE'R METHODOF sEcuRING'wIREs TOGETHER v 2 Sheets-Sheet 2 Filed Nov. 6, 1937 Inflentw 30 vide such an assembly Patented June 20, 1939 UNITED STATES.

PATENT OFFICE METHOD OF SECURING WIRES TOGETHE Edwin w. Krueger, River Forest, Ill. I

Application November 6; 1937, Serial No. T734189 2 Claims.

r This invention relates to new and useful improvements in bed spring and method of-assembly and more speciflcally,relates to an assembly in which a wire of afgiven diameter is secured to and-held by one of larger diameter such for example as the individual coil springs to the border wirel'of the bed spring.

In the manufacture of bed springs it is necessary to fasten the tops of the plurality of coil springs positioned along the four sides of the" assemblyto' a rigid border wire or rod of much greater gauge or diameter than that of the springs, which extends completely around the unit. This has heretofore been done in various ways by either wiring the springs to the rod or by cutting grooves in the rod of sumcient size to receive the wireat the springs or by forming such rods, with'such grooves and after position-' ing the springs. in the grooves crimping or folding the sides of the grooves over the springs. The first described method is objectionable because the wiring .tends to loosen and presents projections which become caught in the bedding. The latter methods are objectionable because of the weakening of the border wire due to the removal of material in forming the grooves and the expense involved in so preparing the wire.

The primary object of the invention is to prowhich does not necessitate the removal of any of the material from the border wire and yet results in a positive the border wire at gripping of the springs by all times.

A further object is to provide such a wire assembly that it is simple and inexpensive to manufacture; r

A still further object is to provide a novel meth- I ed by which a wire or rod of a given diameter 40 can be efliciently secured to a wire or rod of larger diameter. 1 1

a A further object is to cold work the rod to forma recess for receiving the smaller wire that is strengthened by said cold working. 1

It is apparent that while this invention is directed primarily to I the manufacture of bed springs it may be utilized in many other instances and it is not intended to limit the invention to such use.

Other objects and advantages are readily apparent from an examination of the accompany- "ing drawings, in which Fig. 1 is a. perspective view of a. portion of a 1 coil spring secured to a portion of a border wire 65 or rod in accordance with the invention.

line 8-8 of Fig. 7.

Fig. 2 is a sectional view along line 2-2 of Fi 1. I a

Fig. 3 is a plan view of a border wire'prepared for receiving the spring wire.

Fig. 4 is a side elevation ofa punch press utie lized in preparing the border wire for assembly in'accordance with this invention with the wire in position and the press open.

Fig. 5 is a cross section of the press taken along line 55 of Fig. 4. 10 Fig. 6 is a crosstsection of the press after the swaging pr splitting action is complete.

Fig. 7 is a side elevation of a punch press having a difierent form of swaging tool and die.

Fig. 8 is a cross-section of the press taken along 15 Fig. 9 is a cross-section of the press of Fig. 7 with movable part depressed.

Fig.'10 is a. plan view of a rod after being subjected to the action of the press shown in Figs. 2b 7, 8 and 9. I

Fig..11 is a cross-section of the rod taken along line H-.|l of Fig. 10.

Fig. 12 is a cross section of the rod shown in Fig. 10 after the smaller wire has been positioned 5 in the opening and the sides have been crimped together. 4

In detail I is the border wire and 2 is the coil spring which is to'be secured to the border wire.

It must be clearly understood that only a por- 30 tion of the complete'bed spring is shown in the drawings but that the unit comprises a plurality of coil springs secured together and to the border wire so as to complete a unit in which the large coil of the springs forms the top of the bed spring. 5

The method followed in securing the springs to the border wire is to swage 'or split the border wire I to form a recess or opening 4 :for

receiving a portion of the coil spring 2. It is well known in the art that drawn wire such as 40 used in forming a border wire has a relatively hard outer surface or.coa.ting and a softer core. It has been found that if the border wire is subjected to a lengthwise swaging action, as soon as the outer surface. of the wire is broken the metal flows away from the initial cut to form a V- or wedge-shaped opening. This is made suf ficiently deep-so as to receive the spring wire and then the sides of the opening are crimped or bent upon the spring wire to hold it in position as shown at 3, Fig.2. It is obvious that the smaller wire may be secured within the swaged opening in other ways. For example the sides of the opening may be compressed to pinch the smaller wire and thus hold it in position.

Fig. 3- shows the elliptical app arance of theopening thus formed when viewed inplan.

.Flg. 6 clearly shows how' the opening shaped in cross-section.

.By swaging the border wire I as indicated no metal is removed from the wire and the flow of the metal provides sides to the opening that are convenient for crimping orbending upon the coil spring wire 2 to hold it in position asshown' in Fig. 2.

- Figs. 4, and 6 illustrates method of performing the swaging operation although it may be done in many diiferent ways utilizing diii'erent tools and apparatus and this invention is not limited to the illustrated manner of accomplishing the desired result.

' A portion of a punch press is and 61h which 5' indicates the movable part of the press and t the stationary part. The details of part of the present invention.

the operating mechanism of the press are not shown as they are familiar to the and form no The stationary part i is provided with a re- .cessed hali round holder 1 for the border wire I.

The sides 8 are slightly tapered to the top to facilitate the removal of the wire after operation.

The movable part 5 is provided with a curved cutting or swaging' tool 8 having a ratherblunt edge II as clearly shown in Figs. 5 and 6.

With the rod l in position in the holder I the swaging or splitting action is commenced and as the edge ll oi the soon breaks through the outer surface 01 the wire I the metal flows away from it and the splitting is continued until an opening of the desired depth and length is obtained.

Fig. 6 is a cross section at the center of the cut .when the action is complete showing the flow of the metal away from the tool I and showing further how the sides I of the holding groove I cause the metal to move upwardly during the swasins action to form; lip'or ear portions ll that extend above the normal surface of the rod l and may be conveniently crlmped or bent over the spring wire 2v after it has been poationed within the opening thus providing a strengthened gripping portion which will securely hold the smaller wire in pomtion.

' It is obvious that in the commercial production of bed springs utilizing this invention a plurality 6f swaging or splitting machines will be arranged so'that simultjheously the "border wire will be swaged in the nhmerous predetermined places to receive the plurality of coil springs adjacent the borderwlre.

shown in Figs. 4, 5

-and 12.

Another method of swaging the'larger wire is shown in Figs. 7, 8 and 9. The-punch press is the same as shown in Figs. 4, 5 and 6 only that the swaging tool I! is bluntas illustrated in F188. 8' -and 9 andthe holder for the rod is formed with a recess It as shown in Figs. 7, 8 and 9. Thus the downward stroke of the press swages the metal it ing M. The displaced metal which was forced into the recess I3 is shown at IS in Figs. 9, 11

The sides ii of the recess so formed are bent or securely as shown in Fig. 12.

criniped together so as to, hold the smaller wire l'l part of the invention.

The word swage" in any form as used herein means the treatment of the larger wire to form an opening for the smaller wire without removing any of the metal fromthe large wire. The swaging is preferably done cold so that the metalso treated is hardened and strengthened.

I claim:

ping means is shown as it may be done in various ways familiar to the artand forms no 1. A methodof securing a smaller wire to a larger wire comprising displacing without removing the metal of a portion of the larger 'wire to form a recess on one side and a protuberance on the other, placing a portion of the smaller wire in said recess and pressing the sides of the recess against the smaller wire to hold it in the recess.

. 2. A method of securing a smaller wire to a largerv wire comprising holding the larger wire after its formation and while cold so as to prevent its bending, displacing without removing the metal of a portion of it to form a recess and to strengthen that portionby compressing the metal,

placing a portion of the smaller wire in said recess and pressing. the sides of the recess against the smaller wire to hold it in the recess.

' sown; w. KRUEGER. 

